Cuplikan kuliah dengan seorang mentor sebagai bagian dari kursus Codegym University. Mendaftar untuk kursus penuh.


"Hai, Amigo. Hari ini kita akan membahas pernyataan if/else ."

"Program akan sedikit berguna jika mereka tidak menanggapi perubahan keadaan eksternal. Sebuah program perlu mengetahui bagaimana beradaptasi dengan keadaan dan melakukan satu tindakan dalam satu kasus dan tindakan lain dalam kasus lain. Di Jawa, ini dicapai dengan menggunakan 'if/else statement' – konstruksi khusus yang memungkinkan untuk melakukan blok kode yang berbeda jika suatu kondisi terpenuhi."

"Terdiri dari tiga bagian: ' kondisi ', ' perintah 1 ' dan ' perintah 2 '. Jika kondisinya benar, maka ' perintah 1 ' dijalankan, jika tidak, 'perintah 2' dijalankan. Perintah-perintah ini tidak pernah dijalankan keduanya. Pernyataannya kurang lebih seperti ini:"

Kode untuk pernyataan if/else
if (condition)
    command_1;
else
    command_2;

"Sungguh menyenangkan! Saya pikir pernyataan itu akan membuat pemrograman jauh lebih menarik!"

"Ya. Ini beberapa contoh untuk Anda:"

Kode Penjelasan
1
if (a < b)
    System.out.println("A is less than B");
else
    System.out.println("B is less than  A");
Jika a kurang dari b, perintah pertama akan dijalankan. Jika tidak, perintah kedua akan dijalankan . Perintah tidak pernah keduanya dieksekusi.
2
if (a < b)
{
    System.out.println("A is less than B");
    System.out.println("B is greater than A");
}
else
{
     System.out.println("B is less than A");
     System.out.println("A is greater than B");
}
Anda dapat mengganti satu perintah dengan blok kode. Sisanya sama.
3
if (a < b)
{
    a = 0;
}
else
{
}
Anda dapat menghilangkan blok else jika kosong.
Ketiga contoh ini sepenuhnya setara.
Anda dapat menghilangkan tanda kurung kurawal jika Anda hanya perlu menjalankan satu perintah. Jika Anda memiliki lebih dari satu perintah, Anda harus tetap menggunakan tanda kurung.
4
if (a < b)
{
    a = 0;
}
5
if (a < b)
    a = 0;

"Diego baru saja memintaku untuk memberimu beberapa tugas."

2
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Good or bad?
Student robot Peter is an overachiever. Previously, his server was configured to receive scores on a five-point scale, but now his teachers have switched to a 12-point scale. But Peter doesn't know this. He's still focused on getting fives. Let's write him a compare method that compares any number with five.
4
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Closest to 10
Ten is extremely popular and attractive number. Everyone wants to be a ten. Or at least as close to it as possible. Two numbers are standing around wondering which of them is cooler. Answer: whichever is closer to ten. Let's write these numbers a displayClosestToTen method that will determine which of them is cooler.
4
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Come on, lucky seven!
Dice games are popular on the planet Foggy Multidimensions. The rules are different than the Earth version: Multidimensionals perceive far more dimensions than primitive three-dimensional earthlings. Their die has 4294967295 faces. Players win only if they roll a number between 50 and 100. We'll write a method that checks whether the die roll is in this range.
4
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Seasons on Terra
An Earth year consists of four seasons, each of which lasts 3 months. While our ship was parked on this cradle of humanity, the Interplanetary Tax Service asked us to write a program to determine the season based on a number corresponding to the month of the year. We don't know why they want it. They say that it's none of our business. But they promised not to remain in our debt.
4
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Positive and negative numbers
Diego is tall, but Alfredo is short. Rishi is experienced, but you're a "noob" programmer. Comparisons are unavoidable in life. And the same thing is true in programs. So we'll continue practicing comparisons and displaying stuff on the screen. This time let's compare the entered number with zero and manipulate it based on the result of the comparison.
4
Tugas
Java Syntax,  level 4pelajaran 4
Terkunci
Day of the week
Planet Terra still has "offices"—an outdated type of workspace. With current technology, there is no need for them, but earthlings tend to be nostalgic and haven't been in a hurry to eradicate them. Terrestrial office workers develop "TGIF syndrome": they constantly want to know what day of the week it is. Let's write a program for them!

Cuplikan kuliah dengan seorang mentor sebagai bagian dari kursus Codegym University. Mendaftar untuk kursus penuh.