The if statement has three formats, namely: 1. [if (Boolean expression) {execution statement}]; 2. [if (Boolean expression) {execution code} else {execution code}]; 3. [if (Boolean expression) {execution code} else if (Boolean expression) {execution code} else {execution code}].
if statements have three formats, namely:
(recommended learning: java entry program)
1. If statement
if(布爾表達(dá)式){
//如果布爾表達(dá)式為true將執(zhí)行的語句
}2. Combined with else statement
if(布爾表達(dá)式){
//如果布爾表達(dá)式的值為true
}else{
//如果布爾表達(dá)式的值為false
}3. If statement with else if...else statement
if(布爾表達(dá)式 1){
//如果布爾表達(dá)式 1的值為true執(zhí)行代碼
}
else if(布爾表達(dá)式 2){
//如果布爾表達(dá)式 2的值為true執(zhí)行代碼
}
else if(布爾表達(dá)式 3){
//如果布爾表達(dá)式 3的值為true執(zhí)行代碼
}
else {
//如果以上布爾表達(dá)式都不為true執(zhí)行代碼
}(Video tutorial recommended : java video tutorial)
Note:
1. Whether the comparison expression is simple or complex, the result must be of Boolean type.
2. If there is only one statement in the statement body controlled by the if statement, the braces can be omitted; if there are multiple statements, they cannot be omitted. It is recommended that they should never be omitted.
For example:
if（比較表達(dá)式） 語句
3. Generally speaking: there is no semicolon when there is an opening brace, and there is no opening brace when there is a semicolon.
For example:
if（比較表達(dá)式）{........}, if(比較表達(dá)式);For example:
public class HelloWorld {
public static void main(String[] args) {
int i=10;
int j=8;
/*
* if語句第一種格式
* */
if(i>j){
System.out.println("我是if語句第一種格式");
}
/*
* if語句第二種格式
* */
if(i<j){
System.out.println("我是if語句第二種格式1");
}else{
System.out.println("我是if語句第二種格式2");
}
/*
* if語句第三種格式
* */
if(i<j){
System.out.println("我是if語句第三種格式1");
}else if(i>j){
System.out.println("我是if語句第三種格式2");
}else{
System.out.println("我是if語句第三種格式3");
}
}
}The output result is as shown in the figure:
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